New York, 9 September 1981 - Institutional correspondence An internal letter from Richard E. Oldenburg to staff at the Museum of Modern Art, New York
São Paulo, 1953 - Institutional correspondence A letter from Paulo E. de Berrêdo Carneiro to Francisco Matarazzo Sobrinho
São Paulo, 11 March 1953 - Institutional correspondence A letter from Paulo E. de Berrêdo Carneiro, dated 11 March 1953
São Paulo, 11 March 1953 - Personal correspondence A letter from Paulo E. de Berrêdo Carneiro, dated 11 March 1953
São Paulo, 19 June 1953 - Institutional correspondence Paulo E. de Berrêdo Carneiro's letter to Arturo Profili
New York, 24 March 1980 - Institutional correspondence A letter from Richard Oldenburg and William Rubin to Javier Tusell